*  / \\
   * b   c
   *  \ /
   *   d<>
   * }</pre>
   *
   * {@code <>} indicates a self-loop
   */
  private static final SuccessorsFunction<Character> MULTI_GRAPH =
      createDirectedGraph("aa", "dd", "ab", "ac", "ca", "cd", "bd");

  /** A directed graph with a single cycle: a -> b -> c -> d -> a. */
  private static final SuccessorsFunction<Character> CYCLE_GRAPH =
      createDirectedGraph("ab", "bc", "cd", "da");

 2.bg 2000.hu 2038.io 2ix.at 2ix.ch 2ix.de 3.azurestaticapps.net 3.bg 32-b.it 3utilities.com 4.bg 4lima.at 4lima.ch 4lima.de 4u.com 5.bg 5g.in 6.bg 611.to 64-b.it 6g.in 7.bg 8.bg 9.bg 9guacu.br a.bg a.prod.fastly.net a.run.app a.se a.ssl.fastly.net aa.no aaa aaa.pro aarborte.no aarp ab.ca abarth abashiri.hokkaido.jp abb abbott abbvie abc abc.br abeno.osaka.jp abiko.chiba.jp abira.hokkaido.jp abkhazia.su able abo.pa abogado abr.it abruzzo.it abu.yamaguchi.jp abudhabi ac ac.ae ac.at ac.be ac.ci ac.cn...

// counties
aa.no
ah.no
bu.no
fm.no
hl.no
hm.no
jan-mayen.no
mr.no
nl.no
nt.no
of.no
ol.no
oslo.no
rl.no
sf.no
st.no
svalbard.no
tm.no
tr.no
va.no
vf.no
// primary and lower secondary schools per county
gs.aa.no
gs.ah.no
gs.bu.no
gs.fm.no
gs.hl.no
gs.hm.no

iart?trahc??o&htua?tacude???s&citsigol?e&civres?r??krow?serp!xe??tnega??t&farcr&ia?otor??hgil&f?orcim??liubemoh?n&atlusnoc?e&duts?m&esuma?n&iatretne?revog??piuqe????olip?ropria?si&lanruoj?tneics???w&erc?ohs??y&cnegreme?dobper?tefas????rref?z??p!.&a&aa?ca?pc??dem?ecartsnd.icb,gne?korgn,r&ab?uj??s&nduolc,rahc21,?t&acova?cca?hcer??wal?ysrab,???s!.&em?gro?hcs,moc?syevrus,ten?ude?vog???t!.&0x,116,ayo,gro?lim?moc?nayn,sulpnpv,t&cennockciuq.tcerid,en??ude?v&dr,og???o&hp?m?v?yk??tol?ua??v&iv?lov??xas?yk...

</pre>

<pre>
'a'
'ä'
'本'
'\t'
'\000'
'\007'
'\377'
'\x07'
'\xff'
'\u12e4'
'\U00101234'
'\''         // rune literal containing single quote character
'aa'         // illegal: too many characters
'\xa'        // illegal: too few hexadecimal digits
'\0'         // illegal: too few octal digits
'\uDFFF'     // illegal: surrogate half

</pre>

<pre>
'a'
'ä'
'本'
'\t'
'\000'
'\007'
'\377'
'\x07'
'\xff'
'\u12e4'
'\U00101234'
'\''         // rune literal containing single quote character
'aa'         // illegal: too many characters
'\k'         // illegal: k is not recognized after a backslash
'\xa'        // illegal: too few hexadecimal digits
'\0'         // illegal: too few octal digits

	STI                                     // fb
	STMXCSR (BX)                            // 0fae1b
	STMXCSR (R11)                           // 410fae1b
	STOSB                                   // aa
	STOSL                                   // ab
	STOSQ                                   // 48ab
	STOSW                                   // 66ab
	STRW (BX)                               // 660f000b